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To obtain information about changes of basic fibroblast growth factor (bFGF) in the brain under a chronic hypertensive condition, we immunohistochemically studied the distribution and level of bFGF in the brain of stroke-prone spontaneously hypertensive rats (SHRSPs). The advanced cerebral lesions in SHRSPs demonstrated massive bleeding, cavity formation(More)
Cerebral aneurysms were induced experimentally in rats by ligating the common carotid artery on one side, making the animals hypertensive, and feeding them the lathyrogen beta-aminopropionitrile. On analysis of this experimental model, haemodynamic stress, hypertension and metabolic disorder of the connective tissue proved to be of primary importance as(More)
Cerebral aneurysms were induced in rats treated with unilateral ligation of the common carotid artery and hypertension produced by renal infarction with or without beta-aminopropionitrile, one of the lathyrogens. In this experiment, cerebral aneurysms developed more frequently than in the previous experiments in which hypertension induced by(More)
BACKGROUND AND PURPOSE Using an animal model, we examined the role of apoptosis in the disappearance of medial smooth muscle cells (SMCs) during the development and growth of cerebral aneurysms. METHODS Various degrees of cerebral aneurysms were induced in the right anterior cerebral artery-olfactory artery bifurcations in 65 Sprague-Dawley rats with(More)
Aneurysmal changes were studied by light and electron microscopes in experimental monkeys to elucidate their pathogenesis. Early changes were found not at the medial defect but in one branch near the apex. Degeneration of the elastic lamina was always more than that of the media throughout the process of aneurysm formation. Endothelial injury was present(More)
All the rats were made hypertensive and fed beta-aminopropionitrile. Among them, cerebral aneurysms were never found in rats without carotid ligation. In rats with ligation of one or both common carotid arteries, cerebral aneurysms developed on the vessels where hemodynamic stresses were apparently increased. The relationship of hemodynamics in the circle(More)
The effects of hypoxia on the epileptic seizures and neuronal damages induced by kainic acid were studied in rats using hypoxic chamber equipment. Rats treated with kainic acid and placed in atmospheric pressure showed typical limbic seizures and regressive neuronal changes in CA3 and CA4 of the hippocampus, while those kept in a hypoxic chamber with 8.5%(More)
We investigated heparin-binding epidermal growth factor-like growth factor (HB-EGF) gene and protein expression in the central nervous system of prenatal and early postnatal rats. Assay by northern blot analysis showed that the HB-EGF mRNA was markedly expressed in the brain. In situ hybridization and immunohistochemical techniques showed that concordant(More)
Saccular cerebral aneurysms were successfully induced in rats treated with beta-aminopropionitrile, deoxycorticosterone and salt hypertension and ligation of unilateral common carotid artery. This experiment was performed on the hypothesis that if hemodynamic stresses were increased on the fragile, cerebral arterial wall of beta-aminopropionitrile-fed(More)
Saccular cerebral aneurysms were successfully induced in two monkeys treated with ligation of the common carotid artery, experimental hypertension, and beta-aminopropionitrile feeding. The cerebral aneurysms developed on the large arteries at the base of the brain, such as the anterior communicating artery and the internal carotid artery at the origin of(More)